It truly depends on your batting. Check the package to see how far apart you can quilt with that batting. Also, how large is the quilt? If you have long sections of border (i.e., bed size quilt) it might be more problematic vs a wall hanging that is not going to be laundered as frequently. I would probably be tempted to put some sort of quilting in the borders regardless - just to make sure there is no shifting even with the SID that you've done. Is there a spot within the fabric design that you could hide a 'tack' type stitch at least?